I didn’ t hear the sound, so I ______ asleep.A、must be B、must have beenC、sh

游客2023-10-09 57

问题 I didn’ t hear the sound, so I ______ asleep.

选项 A、must be
B、must have been
C、should be
D、should have been

答案 B

解析本题考查主观推测的用法。前面didn’t hear暗示了这个情况发生在过去，因此后面应该是对过去的推测。must have done表示对过去的十分肯定的推测。

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